Industrial chemicals · Taylor, TXTechnical Data Sheet
Sodium Hydroxide Flakes
Technical · 97%
- CAS number
- 1310-73-2
- UN number
- UN1823
- Hazard class · packing group
- 8 · PG II
- Structure
Structure · PubChem - Grade
- Technical · 97%
- Signal word
- Danger
- Hazards
- Proper shipping name
- Sodium hydroxide, solid
Identity & Composition
- Product Name
- Sodium Hydroxide Flakes
- Alliance Code
- sodium-hydroxide-flakes
- Grade
- Technical
- Concentration
- 97%
- CAS Number
- 1310-73-2PubChem
- Formula
- —PubChem
- Molecular Weight
- 39.997PubChem
- Product Type
- Pure substance
Specifications
| Test | Specification | Typical | Method | Source |
|---|---|---|---|---|
| Purity (dry basis), as NaOH | 98% Min | 99.6% | ASTM E291 | Interpreted |
| Sodium chloride (NaCl) | 100 Max ppm | 46 ppm | ASTM E291 | Interpreted |
| Heavy metals (as Pb) | ≤ 0.001% | 0.000072% | — | Interpreted |
| Iron (Fe) | 15 ppm max | 0.70 ppm | — | Interpreted |
| Nickel (Ni) | 5.0 Max ppm | 1.1 ppm | HACH 10220 | Interpreted |
| Sodium carbonate (Na2CO3) | 0.2 Max % | 0.13 % | ASTM E291 | Interpreted |
| Water (H2O) | 1.0 % Max | 0.4 % | Karl Fischer titration | Interpreted |
| Sodium sulfate (Na2SO4) | 0.05 % Max | 0.0008 % | Turbidimetric (BaSO4) | Interpreted |
| aluminum | 40 ppm max | 1.5 ppm | — | Interpreted |
| calcium | 45 ppm max | 0.7 ppm | — | Interpreted |
| copper | 1.5 ppm max | 0.13 ppm | — | Interpreted |
| excess sodium hydroxide | 98 % min | 99.0 % | — | Interpreted |
| magnesium | 30 ppm max | 0.30 ppm | — | Interpreted |
| manganese | 0.75 ppm max | 0.050 ppm | — | Interpreted |
| naclo3 | 40 ppm max | 13 ppm | — | Interpreted |
| retained 16mesh | 25 % max | 15.5 % | — | Interpreted |
| retained 4mesh | 95 % max | 82.6 % | — | Interpreted |
| silicon | 350 ppm max | 13 ppm | — | Interpreted |
| strontium | 15 ppm max | 0.33 ppm | — | Interpreted |
Values are reproduced from the current product reference. Source labels do not by themselves establish a supplier guarantee or a test result for your lot. Confirm applicable acceptance limits and request lot-specific documentation.
Available GradesSame CAS, alternate grades and concentrations
| Grade | Concentration | Typical Assay | SKU | TDS |
|---|---|---|---|---|
| This grade Technical | 97% | — | current | current |
| ACS Grade | 97% | — | sodium-hydroxide-flakes-acs-grade | View TDS → |
Typical assay shown is the rolling-window mean from the sibling product's most recent lots. Grade selection drives downstream end-use — verify the sibling grade matches your specification before substitution.
Physical & Chemical Properties
| Property | Value | Source |
|---|---|---|
| Appearance | White crystalline flakes | Adjudicated |
| Form | Solid | Published reference |
| Odor | Odorless | Adjudicated |
| pH | About 14 (5% solution) | Adjudicated |
| Specific Gravity | 2.13 at 20 °C (water = 1) | Adjudicated |
| Density | 1.5 at 68 °F (USCG, 1999) - Denser than water; will sink | Published reference |
| Boiling Point | 1,388–1,390 °C (2,530–2,534 °F) | Adjudicated |
| Melting Point | 318–323 °C (604–613 °F) | Adjudicated |
| Flash Point | Not applicable | Adjudicated |
| Vapor Pressure | Negligible at 20 °C (< 0.1 hPa) | Adjudicated |
| Solubility (water) | Very soluble in water, about 1,090–1,260 g/L at 20 °C (strongly exothermic); soluble in ethanol, methanol and glycerol | Adjudicated |
Strong base — hygroscopic; values may drift in opened containers. See storage guidance.
Materials of Construction
| Material | Rating | Conditions | Source |
|---|---|---|---|
| Polypropylene / polyethylene (PP/PE) bag | Compatible | Solid caustic soda flakes/pearls (>=99% NaOH), 25 kg bags; no temperature stated | basekim.com |
Compatibility is drawn from published manufacturer and supplier documentation for this product; each rating is sourced. Confirm against your specific duty cycle before equipment selection.
Regulatory & Transport
DOT / 49 CFR
- UN Number
- UN1823Adjudicated
- Hazard Class
- 8Adjudicated
- Packing Group
- IIAdjudicated
- Proper Shipping Name
- Sodium hydroxide, solidAdjudicated
GHS / OSHA HCS 2024
- Signal Word
- DangerAdjudicated
- H-Codes (Hazard Statements)
- H290, H314Adjudicated
- P-Codes (Precautionary Statements)
- P234, P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P390, P405, P406, P501Adjudicated
Occupational Exposure Limits
- OSHA PEL (29 CFR 1910.1000)
- 2 mg/m³ TWAOSHA 29 CFR 1910.1000
- ACGIH TLV
- 2 mg/m³ CeilingAdjudicated
- NIOSH REL
- 2 mg/m³ CeilingAdjudicated
- NIOSH IDLH
- 10 mg/m³Adjudicated
Transport descriptions reflect 49 CFR 172.101 lookup at time of publication. Sourced data: NIOSH Pocket Guide for REL/IDLH, OSHA Z-Tables for PEL. Always verify against the latest regulatory text before shipment-critical decisions.
Health & Fire Hazard
Acute Toxicology
- LD₅₀ Dermal (rabbit)
- 1,350 mg/kgAdjudicated
Acute toxicology values from SDS Section 11 or NIOSH RTECS.
Supplier Qualification Packet
One zipped download containing the TDS, SDS, latest lot COA (when available), and a fresh Letter of Continuing Guaranty for Sodium Hydroxide Flakes. Every file included is SHA-256 hashed and listed in a manifest your QA team can audit.
Catalog EquivalentsCross-reference vs major chemical suppliers
Sigma-Aldrich
| SKU | Grade | Conc. | Match | Notes |
|---|---|---|---|---|
| S5881 | ACS Reagent | ≥97% | Unverified candidate | Reagent grade, anhydrous pellets |
Cross-references are informational. Confirm against the manufacturer's current specification before substitution. Competitor trademarks are property of their respective owners.
Applications
- pH adjustment in water treatment; pulp and paper; textile scouring and dyeing; soap and detergent manufacturing; petroleum refining and oil drilling; aluminum processing; chemical synthesisbasekim.com
- Organic synthesis, petroleum product refining, textile industry (viscose silk, fabric bleaching), paper and aniline industry, soap making, production of aluminum and sodium metal, soluble glass and alkaline accumulatorsbci.sa
- Pulp and paper processing, textile scouring and dyeing, and soap and detergent manufacturingbasekim.com
- Petroleum refining, oil drilling, aluminum processing, and chemical synthesisbasekim.com
Applications are drawn from published manufacturer and supplier documentation; each is sourced. Suitability for a specific use is the buyer's to confirm.
Storage & Handling
- Recommended Storage
- Keep tightly closed in a dry place — the flakes absorb moisture and carbon dioxide from air. Use steel, polyethylene or polypropylene containers, never aluminum or galvanized metal. Keep away from acids.Adjudicated
- Handling Precautions
- Use full PPE including chemical splash goggles and alkali-resistant gloves. Add base to water slowly with stirring. Highly exothermic dilution.Class-level guidance — not product-specific; the SDS controls.
- Incompatibilities
- Water in quantity (violent heat release); acids (violent reaction); aluminum, zinc, tin, copper and their alloys, including galvanized metal (releases flammable hydrogen); halogens and organic halogen compounds; nitro compounds; strong oxidizers.Adjudicated
- Shelf Life
- 36 monthschemtradelogistics.comStated by the source for solid sodium hydroxide (Chemtrade pellets, not flakes), stored dry, cool and well-ventilated; some caking may develop within 1 year.
For full hazard, PPE, and emergency response guidance, refer to the Safety Data Sheet (SDS) for this product. The SDS controls in all cases where guidance differs.
Packaging & Logistics
Shipping Description (US DOT)
UN1823, Sodium hydroxide, solid, 8, PG II
Sourced from 49 CFR 172.101. Confirm against shipping documents and carrier requirements before tender.
Revision History
Last reviewed 2026-06-18 by Andre Taki, Chief Commercial Officer, DOT Hazmat–certified (49 CFR 172.704).
| Version | Date | Change | Trigger |
|---|---|---|---|
| 1.4 | 2026-10-07 | Canonical data updated: 24 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.3 | 2026-09-30 | Canonical data updated: 3 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.2 | 2026-07-22 | Canonical data updated: 2 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.1 | 2026-06-18 | Canonical data re-verified: 3 fields updated against independent vendor SDSs, CLP Annex VI, 49 CFR, and OSHA HazCom 2024 (GHS classification, hazard/precautionary codes, signal word, physical properties as applicable).
| canonical_change |
| 1.0 | 2026-05-20 | Initial URL-first TDS published from canonical chemistry registry. | initial |
This Technical Data Sheet is provided for technical reference. The Safety Data Sheet (SDS) controls in all cases where guidance differs. Values reflect Alliance Chemical canonical data at time of generation; subsequent revisions are recorded in the Revision History above.